The LHCb information generated interesting theoretical investigations to
explain structure of new resonances \(X_{0}\)  and \(X_{1}\) , calculate their
masses, and if possible, estimate widths [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}. In these papers the authors made different suggestions about internal
organization of these resonances, and used various methods and schemes to
compute their parameters. The diquark-antidiquark and hadronic molecule
pictures are dominant models to account for collected experimental data. For
example, in Refs. [1]}, [2]} \(X_{0}\)  was
considered as a scalar tetraquark \(X_{0}=[sc][\overline{u}\overline{d}]\) 
using a phenomenological approach and the sum rule method, respectively. In
Ref. [4]} \(X_{0}\)  was interpreted as \(S\) -wave hadronic \(D^{\ast -}K^{\ast +}\)  molecule, whereas \(X_{1}\)  considered \(P\) -wave
diquark-antidiquark state \(X_{1}=[ud][\overline{s}\overline{c}]\) . In Ref. [6]}, on the contrary, it was asserted that two resonance-like
peaks generated in the process \(B^{+}\rightarrow D^{+}D^{-}K^{+}\)  due to
rescattering effects may emerge in LHCb experiment as the states \(X_{0}\) 
and \(X_{1}\) .
